1# 2# Copyright (c) 2013-2020, ARM Limited and Contributors. All rights reserved. 3# 4# SPDX-License-Identifier: BSD-3-Clause 5# 6 7# 8# Trusted Firmware Version 9# 10VERSION_MAJOR := 2 11VERSION_MINOR := 2 12 13# Default goal is build all images 14.DEFAULT_GOAL := all 15 16# Avoid any implicit propagation of command line variable definitions to 17# sub-Makefiles, like CFLAGS that we reserved for the firmware images' 18# usage. Other command line options like "-s" are still propagated as usual. 19MAKEOVERRIDES = 20 21MAKE_HELPERS_DIRECTORY := make_helpers/ 22include ${MAKE_HELPERS_DIRECTORY}build_macros.mk 23include ${MAKE_HELPERS_DIRECTORY}build_env.mk 24 25################################################################################ 26# Default values for build configurations, and their dependencies 27################################################################################ 28 29include ${MAKE_HELPERS_DIRECTORY}defaults.mk 30 31# Assertions enabled for DEBUG builds by default 32ENABLE_ASSERTIONS := ${DEBUG} 33ENABLE_PMF := ${ENABLE_RUNTIME_INSTRUMENTATION} 34PLAT := ${DEFAULT_PLAT} 35 36################################################################################ 37# Checkpatch script options 38################################################################################ 39 40CHECKCODE_ARGS := --no-patch 41# Do not check the coding style on imported library files or documentation files 42INC_LIB_DIRS_TO_CHECK := $(sort $(filter-out \ 43 include/lib/libfdt \ 44 include/lib/libc, \ 45 $(wildcard include/lib/*))) 46INC_DIRS_TO_CHECK := $(sort $(filter-out \ 47 include/lib, \ 48 $(wildcard include/*))) 49LIB_DIRS_TO_CHECK := $(sort $(filter-out \ 50 lib/compiler-rt \ 51 lib/libfdt% \ 52 lib/libc, \ 53 $(wildcard lib/*))) 54ROOT_DIRS_TO_CHECK := $(sort $(filter-out \ 55 lib \ 56 include \ 57 docs \ 58 %.rst, \ 59 $(wildcard *))) 60CHECK_PATHS := ${ROOT_DIRS_TO_CHECK} \ 61 ${INC_DIRS_TO_CHECK} \ 62 ${INC_LIB_DIRS_TO_CHECK} \ 63 ${LIB_DIRS_TO_CHECK} 64 65 66################################################################################ 67# Process build options 68################################################################################ 69 70# Verbose flag 71ifeq (${V},0) 72 Q:=@ 73 ECHO:=@echo 74 CHECKCODE_ARGS += --no-summary --terse 75else 76 Q:= 77 ECHO:=$(ECHO_QUIET) 78endif 79 80ifneq ($(findstring s,$(filter-out --%,$(MAKEFLAGS))),) 81 Q:=@ 82 ECHO:=$(ECHO_QUIET) 83endif 84 85export Q ECHO 86 87# Process Debug flag 88$(eval $(call add_define,DEBUG)) 89ifneq (${DEBUG}, 0) 90 BUILD_TYPE := debug 91 TF_CFLAGS += -g 92 93 ifneq ($(findstring clang,$(notdir $(CC))),) 94 ASFLAGS += -g 95 else 96 ASFLAGS += -g -Wa,--gdwarf-2 97 endif 98 99 # Use LOG_LEVEL_INFO by default for debug builds 100 LOG_LEVEL := 40 101else 102 BUILD_TYPE := release 103 # Use LOG_LEVEL_NOTICE by default for release builds 104 LOG_LEVEL := 20 105endif 106 107# Default build string (git branch and commit) 108ifeq (${BUILD_STRING},) 109 BUILD_STRING := $(shell git describe --always --dirty --tags 2> /dev/null) 110endif 111VERSION_STRING := v${VERSION_MAJOR}.${VERSION_MINOR}(${BUILD_TYPE}):${BUILD_STRING} 112 113# The cert_create tool cannot generate certificates individually, so we use the 114# target 'certificates' to create them all 115ifneq (${GENERATE_COT},0) 116 FIP_DEPS += certificates 117 FWU_FIP_DEPS += fwu_certificates 118endif 119 120# Process BRANCH_PROTECTION value and set 121# Pointer Authentication and Branch Target Identification flags 122ifeq (${BRANCH_PROTECTION},0) 123 # Default value turns off all types of branch protection 124 BP_OPTION := none 125else ifneq (${ARCH},aarch64) 126 $(error BRANCH_PROTECTION requires AArch64) 127else ifeq (${BRANCH_PROTECTION},1) 128 # Enables all types of branch protection features 129 BP_OPTION := standard 130 ENABLE_BTI := 1 131 ENABLE_PAUTH := 1 132else ifeq (${BRANCH_PROTECTION},2) 133 # Return address signing to its standard level 134 BP_OPTION := pac-ret 135 ENABLE_PAUTH := 1 136else ifeq (${BRANCH_PROTECTION},3) 137 # Extend the signing to include leaf functions 138 BP_OPTION := pac-ret+leaf 139 ENABLE_PAUTH := 1 140else 141 $(error Unknown BRANCH_PROTECTION value ${BRANCH_PROTECTION}) 142endif 143 144# USE_SPINLOCK_CAS requires AArch64 build 145ifeq (${USE_SPINLOCK_CAS},1) 146ifneq (${ARCH},aarch64) 147 $(error USE_SPINLOCK_CAS requires AArch64) 148else 149 $(info USE_SPINLOCK_CAS is an experimental feature) 150endif 151endif 152 153# USE_DEBUGFS experimental feature recommended only in debug builds 154ifeq (${USE_DEBUGFS},1) 155ifeq (${DEBUG},1) 156 $(warning DEBUGFS experimental feature is enabled.) 157else 158 $(warning DEBUGFS experimental, recommended in DEBUG builds ONLY) 159endif 160endif 161 162################################################################################ 163# Toolchain 164################################################################################ 165 166HOSTCC := gcc 167export HOSTCC 168 169CC := ${CROSS_COMPILE}gcc 170CPP := ${CROSS_COMPILE}cpp 171AS := ${CROSS_COMPILE}gcc 172AR := ${CROSS_COMPILE}ar 173LINKER := ${CROSS_COMPILE}ld 174OC := ${CROSS_COMPILE}objcopy 175OD := ${CROSS_COMPILE}objdump 176NM := ${CROSS_COMPILE}nm 177PP := ${CROSS_COMPILE}gcc -E 178DTC := dtc 179 180# Use ${LD}.bfd instead if it exists (as absolute path or together with $PATH). 181ifneq ($(strip $(wildcard ${LD}.bfd) \ 182 $(foreach dir,$(subst :, ,${PATH}),$(wildcard ${dir}/${LINKER}.bfd))),) 183LINKER := ${LINKER}.bfd 184endif 185 186ifeq (${ARM_ARCH_MAJOR},7) 187target32-directive = -target arm-none-eabi 188# Will set march32-directive from platform configuration 189else 190target32-directive = -target armv8a-none-eabi 191 192# Set the compiler's target architecture profile based on ARM_ARCH_MINOR option 193ifeq (${ARM_ARCH_MINOR},0) 194march32-directive = -march=armv8-a 195march64-directive = -march=armv8-a 196else 197march32-directive = -march=armv8.${ARM_ARCH_MINOR}-a 198march64-directive = -march=armv8.${ARM_ARCH_MINOR}-a 199endif 200endif 201 202ifneq ($(findstring armclang,$(notdir $(CC))),) 203TF_CFLAGS_aarch32 = -target arm-arm-none-eabi $(march32-directive) 204TF_CFLAGS_aarch64 = -target aarch64-arm-none-eabi $(march64-directive) 205LD = $(LINKER) 206AS = $(CC) -c -x assembler-with-cpp $(TF_CFLAGS_$(ARCH)) 207CPP = $(CC) -E $(TF_CFLAGS_$(ARCH)) 208PP = $(CC) -E $(TF_CFLAGS_$(ARCH)) 209else ifneq ($(findstring clang,$(notdir $(CC))),) 210TF_CFLAGS_aarch32 = $(target32-directive) $(march32-directive) 211TF_CFLAGS_aarch64 = -target aarch64-elf $(march64-directive) 212LD = ld.lld 213ifeq (, $(shell which $(LD))) 214$(error "No $(LD) in PATH, make sure it is installed or set LD to a different linker") 215endif 216AS = $(CC) -c -x assembler-with-cpp $(TF_CFLAGS_$(ARCH)) 217CPP = $(CC) -E 218PP = $(CC) -E 219else ifneq ($(findstring gcc,$(notdir $(CC))),) 220TF_CFLAGS_aarch32 = $(march32-directive) 221TF_CFLAGS_aarch64 = $(march64-directive) 222ifeq ($(ENABLE_LTO),1) 223 # Enable LTO only for aarch64 224 ifeq (${ARCH},aarch64) 225 LTO_CFLAGS = -flto 226 # Use gcc as a wrapper for the ld, recommended for LTO 227 LINKER := ${CROSS_COMPILE}gcc 228 endif 229endif 230LD = $(LINKER) 231else 232TF_CFLAGS_aarch32 = $(march32-directive) 233TF_CFLAGS_aarch64 = $(march64-directive) 234LD = $(LINKER) 235endif 236 237ifeq (${AARCH32_INSTRUCTION_SET},A32) 238TF_CFLAGS_aarch32 += -marm 239else ifeq (${AARCH32_INSTRUCTION_SET},T32) 240TF_CFLAGS_aarch32 += -mthumb 241else 242$(error Error: Unknown AArch32 instruction set ${AARCH32_INSTRUCTION_SET}) 243endif 244 245TF_CFLAGS_aarch32 += -mno-unaligned-access 246TF_CFLAGS_aarch64 += -mgeneral-regs-only -mstrict-align 247 248ifneq (${BP_OPTION},none) 249TF_CFLAGS_aarch64 += -mbranch-protection=${BP_OPTION} 250endif 251 252ASFLAGS_aarch32 = $(march32-directive) 253ASFLAGS_aarch64 = $(march64-directive) 254 255# General warnings 256WARNINGS := -Wall -Wmissing-include-dirs -Wunused \ 257 -Wdisabled-optimization -Wvla -Wshadow \ 258 -Wno-unused-parameter 259 260# Additional warnings 261# Level 1 262WARNING1 := -Wextra 263WARNING1 += -Wmissing-format-attribute 264WARNING1 += -Wmissing-prototypes 265WARNING1 += -Wold-style-definition 266 267# Level 2 268WARNING2 := -Waggregate-return 269WARNING2 += -Wcast-align 270WARNING2 += -Wnested-externs 271 272WARNING3 := -Wbad-function-cast 273WARNING3 += -Wcast-qual 274WARNING3 += -Wconversion 275WARNING3 += -Wpacked 276WARNING3 += -Wpointer-arith 277WARNING3 += -Wredundant-decls 278WARNING3 += -Wswitch-default 279 280ifeq (${W},1) 281WARNINGS += $(WARNING1) 282else ifeq (${W},2) 283WARNINGS += $(WARNING1) $(WARNING2) 284else ifeq (${W},3) 285WARNINGS += $(WARNING1) $(WARNING2) $(WARNING3) 286endif 287 288# Compiler specific warnings 289ifeq ($(findstring clang,$(notdir $(CC))),) 290# not using clang 291WARNINGS += -Wunused-but-set-variable -Wmaybe-uninitialized \ 292 -Wpacked-bitfield-compat -Wshift-overflow=2 \ 293 -Wlogical-op 294else 295# using clang 296WARNINGS += -Wshift-overflow -Wshift-sign-overflow \ 297 -Wlogical-op-parentheses 298endif 299 300ifneq (${E},0) 301ERRORS := -Werror 302endif 303 304CPPFLAGS = ${DEFINES} ${INCLUDES} ${MBEDTLS_INC} -nostdinc \ 305 $(ERRORS) $(WARNINGS) 306ASFLAGS += $(CPPFLAGS) $(ASFLAGS_$(ARCH)) \ 307 -ffreestanding -Wa,--fatal-warnings 308TF_CFLAGS += $(CPPFLAGS) $(TF_CFLAGS_$(ARCH)) \ 309 -ffunction-sections -fdata-sections \ 310 -ffreestanding -fno-builtin -fno-common \ 311 -Os -std=gnu99 312 313ifeq (${SANITIZE_UB},on) 314TF_CFLAGS += -fsanitize=undefined -fno-sanitize-recover 315endif 316ifeq (${SANITIZE_UB},trap) 317TF_CFLAGS += -fsanitize=undefined -fno-sanitize-recover \ 318 -fsanitize-undefined-trap-on-error 319endif 320 321GCC_V_OUTPUT := $(shell $(CC) -v 2>&1) 322 323# LD = armlink 324ifneq ($(findstring armlink,$(notdir $(LD))),) 325TF_LDFLAGS += --diag_error=warning --lto_level=O1 326TF_LDFLAGS += --remove --info=unused,unusedsymbols 327TF_LDFLAGS += $(TF_LDFLAGS_$(ARCH)) 328 329# LD = gcc (used when GCC LTO is enabled) 330else ifneq ($(findstring gcc,$(notdir $(LD))),) 331# Pass ld options with Wl or Xlinker switches 332TF_LDFLAGS += -Wl,--fatal-warnings -O1 333TF_LDFLAGS += -Wl,--gc-sections 334ifeq ($(ENABLE_LTO),1) 335 ifeq (${ARCH},aarch64) 336 TF_LDFLAGS += -flto -fuse-linker-plugin 337 endif 338endif 339# GCC automatically adds fix-cortex-a53-843419 flag when used to link 340# which breaks some builds, so disable if errata fix is not explicitly enabled 341ifneq (${ERRATA_A53_843419},1) 342 TF_LDFLAGS += -mno-fix-cortex-a53-843419 343endif 344TF_LDFLAGS += -nostdlib 345TF_LDFLAGS += $(subst --,-Xlinker --,$(TF_LDFLAGS_$(ARCH))) 346 347# LD = gcc-ld (ld) or llvm-ld (ld.lld) or other 348else 349TF_LDFLAGS += --fatal-warnings -O1 350TF_LDFLAGS += --gc-sections 351# ld.lld doesn't recognize the errata flags, 352# therefore don't add those in that case 353ifeq ($(findstring ld.lld,$(notdir $(LD))),) 354TF_LDFLAGS += $(TF_LDFLAGS_$(ARCH)) 355endif 356endif 357 358DTC_FLAGS += -I dts -O dtb 359DTC_CPPFLAGS += -P -nostdinc -Iinclude -Ifdts -undef -x assembler-with-cpp 360 361################################################################################ 362# Common sources and include directories 363################################################################################ 364include lib/compiler-rt/compiler-rt.mk 365 366BL_COMMON_SOURCES += common/bl_common.c \ 367 common/tf_log.c \ 368 common/${ARCH}/debug.S \ 369 drivers/console/multi_console.c \ 370 lib/${ARCH}/cache_helpers.S \ 371 lib/${ARCH}/misc_helpers.S \ 372 plat/common/plat_bl_common.c \ 373 plat/common/plat_log_common.c \ 374 plat/common/${ARCH}/plat_common.c \ 375 plat/common/${ARCH}/platform_helpers.S \ 376 ${COMPILER_RT_SRCS} 377 378ifeq ($(notdir $(CC)),armclang) 379BL_COMMON_SOURCES += lib/${ARCH}/armclang_printf.S 380endif 381 382ifeq (${SANITIZE_UB},on) 383BL_COMMON_SOURCES += plat/common/ubsan.c 384endif 385 386INCLUDES += -Iinclude \ 387 -Iinclude/arch/${ARCH} \ 388 -Iinclude/lib/cpus/${ARCH} \ 389 -Iinclude/lib/el3_runtime/${ARCH} \ 390 ${PLAT_INCLUDES} \ 391 ${SPD_INCLUDES} 392 393include common/backtrace/backtrace.mk 394 395################################################################################ 396# Generic definitions 397################################################################################ 398 399include ${MAKE_HELPERS_DIRECTORY}plat_helpers.mk 400 401BUILD_BASE := ./build 402BUILD_PLAT := ${BUILD_BASE}/${PLAT}/${BUILD_TYPE} 403 404SPDS := $(sort $(filter-out none, $(patsubst services/spd/%,%,$(wildcard services/spd/*)))) 405 406# Platforms providing their own TBB makefile may override this value 407INCLUDE_TBBR_MK := 1 408 409 410################################################################################ 411# Include SPD Makefile if one has been specified 412################################################################################ 413 414ifneq (${SPD},none) 415ifeq (${ARCH},aarch32) 416 $(error "Error: SPD is incompatible with AArch32.") 417endif 418ifdef EL3_PAYLOAD_BASE 419 $(warning "SPD and EL3_PAYLOAD_BASE are incompatible build options.") 420 $(warning "The SPD and its BL32 companion will be present but ignored.") 421endif 422 # We expect to locate an spd.mk under the specified SPD directory 423 SPD_MAKE := $(wildcard services/spd/${SPD}/${SPD}.mk) 424 425 ifeq (${SPD_MAKE},) 426 $(error Error: No services/spd/${SPD}/${SPD}.mk located) 427 endif 428 $(info Including ${SPD_MAKE}) 429 include ${SPD_MAKE} 430 431 # If there's BL32 companion for the chosen SPD, we expect that the SPD's 432 # Makefile would set NEED_BL32 to "yes". In this case, the build system 433 # supports two mutually exclusive options: 434 # * BL32 is built from source: then BL32_SOURCES must contain the list 435 # of source files to build BL32 436 # * BL32 is a prebuilt binary: then BL32 must point to the image file 437 # that will be included in the FIP 438 # If both BL32_SOURCES and BL32 are defined, the binary takes precedence 439 # over the sources. 440endif 441 442################################################################################ 443# Include the platform specific Makefile after the SPD Makefile (the platform 444# makefile may use all previous definitions in this file) 445################################################################################ 446 447include ${PLAT_MAKEFILE_FULL} 448 449$(eval $(call MAKE_PREREQ_DIR,${BUILD_PLAT})) 450 451ifeq (${ARM_ARCH_MAJOR},7) 452include make_helpers/armv7-a-cpus.mk 453endif 454 455PIE_FOUND := $(findstring --enable-default-pie,${GCC_V_OUTPUT}) 456ifneq ($(PIE_FOUND),) 457 TF_CFLAGS += -fno-PIE 458endif 459 460ifneq ($(findstring gcc,$(notdir $(LD))),) 461 PIE_LDFLAGS += -Wl,-pie -Wl,--no-dynamic-linker 462else 463 PIE_LDFLAGS += -pie --no-dynamic-linker 464endif 465 466ifeq ($(ENABLE_PIE),1) 467ifeq ($(BL2_AT_EL3),1) 468ifneq ($(BL2_IN_XIP_MEM),1) 469 BL2_CFLAGS += -fpie 470 BL2_LDFLAGS += $(PIE_LDFLAGS) 471endif 472endif 473 BL31_CFLAGS += -fpie 474 BL31_LDFLAGS += $(PIE_LDFLAGS) 475ifeq ($(ARCH),aarch64) 476 BL32_CFLAGS += -fpie 477 BL32_LDFLAGS += $(PIE_LDFLAGS) 478endif 479endif 480 481# Include the CPU specific operations makefile, which provides default 482# values for all CPU errata workarounds and CPU specific optimisations. 483# This can be overridden by the platform. 484include lib/cpus/cpu-ops.mk 485 486ifeq (${ARCH},aarch32) 487NEED_BL32 := yes 488 489################################################################################ 490# Build `AARCH32_SP` as BL32 image for AArch32 491################################################################################ 492ifneq (${AARCH32_SP},none) 493# We expect to locate an sp.mk under the specified AARCH32_SP directory 494AARCH32_SP_MAKE := $(wildcard bl32/${AARCH32_SP}/${AARCH32_SP}.mk) 495 496ifeq (${AARCH32_SP_MAKE},) 497 $(error Error: No bl32/${AARCH32_SP}/${AARCH32_SP}.mk located) 498endif 499 500$(info Including ${AARCH32_SP_MAKE}) 501include ${AARCH32_SP_MAKE} 502endif 503 504endif 505 506################################################################################ 507# Include libc if not overridden 508################################################################################ 509ifeq (${OVERRIDE_LIBC},0) 510include lib/libc/libc.mk 511endif 512 513################################################################################ 514# Check incompatible options 515################################################################################ 516 517ifdef EL3_PAYLOAD_BASE 518 ifdef PRELOADED_BL33_BASE 519 $(warning "PRELOADED_BL33_BASE and EL3_PAYLOAD_BASE are \ 520 incompatible build options. EL3_PAYLOAD_BASE has priority.") 521 endif 522 ifneq (${GENERATE_COT},0) 523 $(error "GENERATE_COT and EL3_PAYLOAD_BASE are incompatible build options.") 524 endif 525 ifneq (${TRUSTED_BOARD_BOOT},0) 526 $(error "TRUSTED_BOARD_BOOT and EL3_PAYLOAD_BASE are incompatible build options.") 527 endif 528endif 529 530ifeq (${NEED_BL33},yes) 531 ifdef EL3_PAYLOAD_BASE 532 $(warning "BL33 image is not needed when option \ 533 BL33_PAYLOAD_BASE is used and won't be added to the FIP file.") 534 endif 535 ifdef PRELOADED_BL33_BASE 536 $(warning "BL33 image is not needed when option \ 537 PRELOADED_BL33_BASE is used and won't be added to the FIP \ 538 file.") 539 endif 540endif 541 542# When building for systems with hardware-assisted coherency, there's no need to 543# use USE_COHERENT_MEM. Require that USE_COHERENT_MEM must be set to 0 too. 544ifeq ($(HW_ASSISTED_COHERENCY)-$(USE_COHERENT_MEM),1-1) 545$(error USE_COHERENT_MEM cannot be enabled with HW_ASSISTED_COHERENCY) 546endif 547 548#For now, BL2_IN_XIP_MEM is only supported when BL2_AT_EL3 is 1. 549ifeq ($(BL2_AT_EL3)-$(BL2_IN_XIP_MEM),0-1) 550$(error "BL2_IN_XIP_MEM is only supported when BL2_AT_EL3 is enabled") 551endif 552 553# For RAS_EXTENSION, require that EAs are handled in EL3 first 554ifeq ($(RAS_EXTENSION),1) 555 ifneq ($(HANDLE_EA_EL3_FIRST),1) 556 $(error For RAS_EXTENSION, HANDLE_EA_EL3_FIRST must also be 1) 557 endif 558endif 559 560# When FAULT_INJECTION_SUPPORT is used, require that RAS_EXTENSION is enabled 561ifeq ($(FAULT_INJECTION_SUPPORT),1) 562 ifneq ($(RAS_EXTENSION),1) 563 $(error For FAULT_INJECTION_SUPPORT, RAS_EXTENSION must also be 1) 564 endif 565endif 566 567# DYN_DISABLE_AUTH can be set only when TRUSTED_BOARD_BOOT=1 568ifeq ($(DYN_DISABLE_AUTH), 1) 569 ifeq (${TRUSTED_BOARD_BOOT}, 0) 570 $(error "TRUSTED_BOARD_BOOT must be enabled for DYN_DISABLE_AUTH to be set.") 571 endif 572endif 573 574# If pointer authentication is used in the firmware, make sure that all the 575# registers associated to it are also saved and restored. 576# Not doing it would leak the value of the keys used by EL3 to EL1 and S-EL1. 577ifeq ($(ENABLE_PAUTH),1) 578 ifeq ($(CTX_INCLUDE_PAUTH_REGS),0) 579 $(error Pointer Authentication requires CTX_INCLUDE_PAUTH_REGS=1) 580 endif 581endif 582 583ifeq ($(CTX_INCLUDE_PAUTH_REGS),1) 584 ifneq (${ARCH},aarch64) 585 $(error CTX_INCLUDE_PAUTH_REGS requires AArch64) 586 else 587 $(info CTX_INCLUDE_PAUTH_REGS is an experimental feature) 588 endif 589endif 590 591ifeq ($(ENABLE_PAUTH),1) 592 $(info Pointer Authentication is an experimental feature) 593endif 594 595ifeq ($(ENABLE_BTI),1) 596 $(info Branch Protection is an experimental feature) 597endif 598 599ifeq ($(CTX_INCLUDE_MTE_REGS),1) 600 ifneq (${ARCH},aarch64) 601 $(error CTX_INCLUDE_MTE_REGS requires AArch64) 602 else 603 $(info CTX_INCLUDE_MTE_REGS is an experimental feature) 604 endif 605endif 606 607################################################################################ 608# Process platform overrideable behaviour 609################################################################################ 610 611# Using BL2 implies that a BL33 image also needs to be supplied for the FIP and 612# Certificate generation tools. This flag can be overridden by the platform. 613ifdef BL2_SOURCES 614 ifdef EL3_PAYLOAD_BASE 615 # If booting an EL3 payload there is no need for a BL33 image 616 # in the FIP file. 617 NEED_BL33 := no 618 else 619 ifdef PRELOADED_BL33_BASE 620 # If booting a BL33 preloaded image there is no need of 621 # another one in the FIP file. 622 NEED_BL33 := no 623 else 624 NEED_BL33 ?= yes 625 endif 626 endif 627endif 628 629# If SCP_BL2 is given, we always want FIP to include it. 630ifdef SCP_BL2 631 NEED_SCP_BL2 := yes 632endif 633 634# For AArch32, BL31 is not currently supported. 635ifneq (${ARCH},aarch32) 636 ifdef BL31_SOURCES 637 # When booting an EL3 payload, there is no need to compile the BL31 image nor 638 # put it in the FIP. 639 ifndef EL3_PAYLOAD_BASE 640 NEED_BL31 := yes 641 endif 642 endif 643endif 644 645# Process TBB related flags 646ifneq (${GENERATE_COT},0) 647 # Common cert_create options 648 ifneq (${CREATE_KEYS},0) 649 $(eval CRT_ARGS += -n) 650 $(eval FWU_CRT_ARGS += -n) 651 ifneq (${SAVE_KEYS},0) 652 $(eval CRT_ARGS += -k) 653 $(eval FWU_CRT_ARGS += -k) 654 endif 655 endif 656 # Include TBBR makefile (unless the platform indicates otherwise) 657 ifeq (${INCLUDE_TBBR_MK},1) 658 include make_helpers/tbbr/tbbr_tools.mk 659 endif 660endif 661 662ifneq (${FIP_ALIGN},0) 663FIP_ARGS += --align ${FIP_ALIGN} 664endif 665 666################################################################################ 667# Include libraries' Makefile that are used in all BL 668################################################################################ 669 670include lib/stack_protector/stack_protector.mk 671 672################################################################################ 673# Auxiliary tools (fiptool, cert_create, etc) 674################################################################################ 675 676# Variables for use with Certificate Generation Tool 677CRTTOOLPATH ?= tools/cert_create 678CRTTOOL ?= ${CRTTOOLPATH}/cert_create${BIN_EXT} 679 680# Variables for use with Firmware Image Package 681FIPTOOLPATH ?= tools/fiptool 682FIPTOOL ?= ${FIPTOOLPATH}/fiptool${BIN_EXT} 683 684# Variables for use with sptool 685SPTOOLPATH ?= tools/sptool 686SPTOOL ?= ${SPTOOLPATH}/sptool${BIN_EXT} 687 688# Variables for use with ROMLIB 689ROMLIBPATH ?= lib/romlib 690 691# Variable for use with Python 692PYTHON ?= python3 693 694# Variables for use with PRINT_MEMORY_MAP 695PRINT_MEMORY_MAP_PATH ?= tools/memory 696PRINT_MEMORY_MAP ?= ${PRINT_MEMORY_MAP_PATH}/print_memory_map.py 697 698################################################################################ 699# Include BL specific makefiles 700################################################################################ 701ifdef BL1_SOURCES 702NEED_BL1 := yes 703include bl1/bl1.mk 704endif 705 706ifdef BL2_SOURCES 707NEED_BL2 := yes 708include bl2/bl2.mk 709endif 710 711ifdef BL2U_SOURCES 712NEED_BL2U := yes 713include bl2u/bl2u.mk 714endif 715 716ifeq (${NEED_BL31},yes) 717ifdef BL31_SOURCES 718include bl31/bl31.mk 719endif 720endif 721 722ifdef FDT_SOURCES 723NEED_FDT := yes 724endif 725 726################################################################################ 727# Build options checks 728################################################################################ 729 730$(eval $(call assert_boolean,COLD_BOOT_SINGLE_CPU)) 731$(eval $(call assert_boolean,CREATE_KEYS)) 732$(eval $(call assert_boolean,CTX_INCLUDE_AARCH32_REGS)) 733$(eval $(call assert_boolean,CTX_INCLUDE_FPREGS)) 734$(eval $(call assert_boolean,CTX_INCLUDE_PAUTH_REGS)) 735$(eval $(call assert_boolean,CTX_INCLUDE_MTE_REGS)) 736$(eval $(call assert_boolean,DEBUG)) 737$(eval $(call assert_boolean,DYN_DISABLE_AUTH)) 738$(eval $(call assert_boolean,EL3_EXCEPTION_HANDLING)) 739$(eval $(call assert_boolean,ENABLE_AMU)) 740$(eval $(call assert_boolean,ENABLE_ASSERTIONS)) 741$(eval $(call assert_boolean,ENABLE_MPAM_FOR_LOWER_ELS)) 742$(eval $(call assert_boolean,ENABLE_PIE)) 743$(eval $(call assert_boolean,ENABLE_PMF)) 744$(eval $(call assert_boolean,ENABLE_PSCI_STAT)) 745$(eval $(call assert_boolean,ENABLE_RUNTIME_INSTRUMENTATION)) 746$(eval $(call assert_boolean,ENABLE_SPE_FOR_LOWER_ELS)) 747$(eval $(call assert_boolean,ENABLE_SVE_FOR_NS)) 748$(eval $(call assert_boolean,ERROR_DEPRECATED)) 749$(eval $(call assert_boolean,FAULT_INJECTION_SUPPORT)) 750$(eval $(call assert_boolean,GENERATE_COT)) 751$(eval $(call assert_boolean,GICV2_G0_FOR_EL3)) 752$(eval $(call assert_boolean,HANDLE_EA_EL3_FIRST)) 753$(eval $(call assert_boolean,HW_ASSISTED_COHERENCY)) 754$(eval $(call assert_boolean,NS_TIMER_SWITCH)) 755$(eval $(call assert_boolean,OVERRIDE_LIBC)) 756$(eval $(call assert_boolean,PL011_GENERIC_UART)) 757$(eval $(call assert_boolean,PROGRAMMABLE_RESET_ADDRESS)) 758$(eval $(call assert_boolean,PSCI_EXTENDED_STATE_ID)) 759$(eval $(call assert_boolean,RAS_EXTENSION)) 760$(eval $(call assert_boolean,RESET_TO_BL31)) 761$(eval $(call assert_boolean,SAVE_KEYS)) 762$(eval $(call assert_boolean,SEPARATE_CODE_AND_RODATA)) 763$(eval $(call assert_boolean,SEPARATE_NOBITS_REGION)) 764$(eval $(call assert_boolean,SPIN_ON_BL1_EXIT)) 765$(eval $(call assert_boolean,SPM_MM)) 766$(eval $(call assert_boolean,TRUSTED_BOARD_BOOT)) 767$(eval $(call assert_boolean,USE_COHERENT_MEM)) 768$(eval $(call assert_boolean,USE_DEBUGFS)) 769$(eval $(call assert_boolean,USE_ROMLIB)) 770$(eval $(call assert_boolean,USE_TBBR_DEFS)) 771$(eval $(call assert_boolean,WARMBOOT_ENABLE_DCACHE_EARLY)) 772$(eval $(call assert_boolean,BL2_AT_EL3)) 773$(eval $(call assert_boolean,BL2_IN_XIP_MEM)) 774$(eval $(call assert_boolean,BL2_INV_DCACHE)) 775$(eval $(call assert_boolean,USE_SPINLOCK_CAS)) 776 777$(eval $(call assert_numeric,ARM_ARCH_MAJOR)) 778$(eval $(call assert_numeric,ARM_ARCH_MINOR)) 779$(eval $(call assert_numeric,BRANCH_PROTECTION)) 780 781ifdef KEY_SIZE 782 $(eval $(call assert_numeric,KEY_SIZE)) 783endif 784 785ifeq ($(filter $(SANITIZE_UB), on off trap),) 786 $(error "Invalid value for SANITIZE_UB: can be one of on, off, trap") 787endif 788 789################################################################################ 790# Add definitions to the cpp preprocessor based on the current build options. 791# This is done after including the platform specific makefile to allow the 792# platform to overwrite the default options 793################################################################################ 794 795$(eval $(call add_define,ARM_ARCH_MAJOR)) 796$(eval $(call add_define,ARM_ARCH_MINOR)) 797$(eval $(call add_define,COLD_BOOT_SINGLE_CPU)) 798$(eval $(call add_define,CTX_INCLUDE_AARCH32_REGS)) 799$(eval $(call add_define,CTX_INCLUDE_FPREGS)) 800$(eval $(call add_define,CTX_INCLUDE_PAUTH_REGS)) 801$(eval $(call add_define,EL3_EXCEPTION_HANDLING)) 802$(eval $(call add_define,CTX_INCLUDE_MTE_REGS)) 803$(eval $(call add_define,ENABLE_AMU)) 804$(eval $(call add_define,ENABLE_ASSERTIONS)) 805$(eval $(call add_define,ENABLE_BTI)) 806$(eval $(call add_define,ENABLE_MPAM_FOR_LOWER_ELS)) 807$(eval $(call add_define,ENABLE_PAUTH)) 808$(eval $(call add_define,ENABLE_PIE)) 809$(eval $(call add_define,ENABLE_PMF)) 810$(eval $(call add_define,ENABLE_PSCI_STAT)) 811$(eval $(call add_define,ENABLE_RUNTIME_INSTRUMENTATION)) 812$(eval $(call add_define,ENABLE_SPE_FOR_LOWER_ELS)) 813$(eval $(call add_define,ENABLE_SVE_FOR_NS)) 814$(eval $(call add_define,ERROR_DEPRECATED)) 815$(eval $(call add_define,FAULT_INJECTION_SUPPORT)) 816$(eval $(call add_define,GICV2_G0_FOR_EL3)) 817$(eval $(call add_define,HANDLE_EA_EL3_FIRST)) 818$(eval $(call add_define,HW_ASSISTED_COHERENCY)) 819$(eval $(call add_define,LOG_LEVEL)) 820$(eval $(call add_define,NS_TIMER_SWITCH)) 821$(eval $(call add_define,PL011_GENERIC_UART)) 822$(eval $(call add_define,PLAT_${PLAT})) 823$(eval $(call add_define,PROGRAMMABLE_RESET_ADDRESS)) 824$(eval $(call add_define,PSCI_EXTENDED_STATE_ID)) 825$(eval $(call add_define,RAS_EXTENSION)) 826$(eval $(call add_define,RESET_TO_BL31)) 827$(eval $(call add_define,SEPARATE_CODE_AND_RODATA)) 828$(eval $(call add_define,SEPARATE_NOBITS_REGION)) 829$(eval $(call add_define,RECLAIM_INIT_CODE)) 830$(eval $(call add_define,SPD_${SPD})) 831$(eval $(call add_define,SPIN_ON_BL1_EXIT)) 832$(eval $(call add_define,SPM_MM)) 833$(eval $(call add_define,TRUSTED_BOARD_BOOT)) 834$(eval $(call add_define,USE_COHERENT_MEM)) 835$(eval $(call add_define,USE_DEBUGFS)) 836$(eval $(call add_define,USE_ROMLIB)) 837$(eval $(call add_define,USE_TBBR_DEFS)) 838$(eval $(call add_define,WARMBOOT_ENABLE_DCACHE_EARLY)) 839$(eval $(call add_define,BL2_AT_EL3)) 840$(eval $(call add_define,BL2_IN_XIP_MEM)) 841$(eval $(call add_define,BL2_INV_DCACHE)) 842$(eval $(call add_define,USE_SPINLOCK_CAS)) 843 844ifeq (${SANITIZE_UB},trap) 845 $(eval $(call add_define,MONITOR_TRAPS)) 846endif 847 848# Define the EL3_PAYLOAD_BASE flag only if it is provided. 849ifdef EL3_PAYLOAD_BASE 850 $(eval $(call add_define,EL3_PAYLOAD_BASE)) 851else 852 # Define the PRELOADED_BL33_BASE flag only if it is provided and 853 # EL3_PAYLOAD_BASE is not defined, as it has priority. 854 ifdef PRELOADED_BL33_BASE 855 $(eval $(call add_define,PRELOADED_BL33_BASE)) 856 endif 857endif 858 859# Define the DYN_DISABLE_AUTH flag only if set. 860ifeq (${DYN_DISABLE_AUTH},1) 861$(eval $(call add_define,DYN_DISABLE_AUTH)) 862endif 863 864ifneq ($(findstring armlink,$(notdir $(LD))),) 865$(eval $(call add_define,USE_ARM_LINK)) 866endif 867 868################################################################################ 869# Build targets 870################################################################################ 871 872.PHONY: all msg_start clean realclean distclean cscope locate-checkpatch checkcodebase checkpatch fiptool sptool fip fwu_fip certtool dtbs memmap 873.SUFFIXES: 874 875all: msg_start 876 877msg_start: 878 @echo "Building ${PLAT}" 879 880ifeq (${ERROR_DEPRECATED},0) 881# Check if deprecated declarations and cpp warnings should be treated as error or not. 882ifneq ($(findstring clang,$(notdir $(CC))),) 883 CPPFLAGS += -Wno-error=deprecated-declarations 884else 885 CPPFLAGS += -Wno-error=deprecated-declarations -Wno-error=cpp 886endif 887# __ASSEMBLY__ is deprecated in favor of the compiler-builtin __ASSEMBLER__. 888ASFLAGS += -D__ASSEMBLY__ 889# AARCH32/AARCH64 macros are deprecated in favor of the compiler-builtin __aarch64__. 890ifeq (${ARCH},aarch32) 891 $(eval $(call add_define,AARCH32)) 892else 893 $(eval $(call add_define,AARCH64)) 894endif 895endif # !ERROR_DEPRECATED 896 897$(eval $(call MAKE_LIB_DIRS)) 898$(eval $(call MAKE_LIB,c)) 899 900# Expand build macros for the different images 901ifeq (${NEED_BL1},yes) 902$(eval $(call MAKE_BL,1)) 903endif 904 905ifeq (${NEED_BL2},yes) 906ifeq (${BL2_AT_EL3}, 0) 907FIP_BL2_ARGS := tb-fw 908endif 909 910$(if ${BL2}, $(eval $(call TOOL_ADD_IMG,bl2,--${FIP_BL2_ARGS})),\ 911 $(eval $(call MAKE_BL,2,${FIP_BL2_ARGS}))) 912endif 913 914ifeq (${NEED_SCP_BL2},yes) 915$(eval $(call TOOL_ADD_IMG,scp_bl2,--scp-fw)) 916endif 917 918ifeq (${NEED_BL31},yes) 919BL31_SOURCES += ${SPD_SOURCES} 920$(if ${BL31}, $(eval $(call TOOL_ADD_IMG,bl31,--soc-fw)),\ 921 $(eval $(call MAKE_BL,31,soc-fw))) 922endif 923 924# If a BL32 image is needed but neither BL32 nor BL32_SOURCES is defined, the 925# build system will call TOOL_ADD_IMG to print a warning message and abort the 926# process. Note that the dependency on BL32 applies to the FIP only. 927ifeq (${NEED_BL32},yes) 928 929BUILD_BL32 := $(if $(BL32),,$(if $(BL32_SOURCES),1)) 930 931$(if ${BUILD_BL32}, $(eval $(call MAKE_BL,32,tos-fw)),\ 932 $(eval $(call TOOL_ADD_IMG,bl32,--tos-fw))) 933endif 934 935# Add the BL33 image if required by the platform 936ifeq (${NEED_BL33},yes) 937$(eval $(call TOOL_ADD_IMG,bl33,--nt-fw)) 938endif 939 940ifeq (${NEED_BL2U},yes) 941$(if ${BL2U}, $(eval $(call TOOL_ADD_IMG,bl2u,--ap-fwu-cfg,FWU_)),\ 942 $(eval $(call MAKE_BL,2u,ap-fwu-cfg,FWU_))) 943endif 944 945# Expand build macros for the different images 946ifeq (${NEED_FDT},yes) 947 $(eval $(call MAKE_DTBS,$(BUILD_PLAT)/fdts,$(FDT_SOURCES))) 948endif 949 950locate-checkpatch: 951ifndef CHECKPATCH 952 $(error "Please set CHECKPATCH to point to the Linux checkpatch.pl file, eg: CHECKPATCH=../linux/scripts/checkpatch.pl") 953else 954ifeq (,$(wildcard ${CHECKPATCH})) 955 $(error "The file CHECKPATCH points to cannot be found, use eg: CHECKPATCH=../linux/scripts/checkpatch.pl") 956endif 957endif 958 959clean: 960 @echo " CLEAN" 961 $(call SHELL_REMOVE_DIR,${BUILD_PLAT}) 962 ${Q}${MAKE} --no-print-directory -C ${FIPTOOLPATH} clean 963 ${Q}${MAKE} PLAT=${PLAT} --no-print-directory -C ${CRTTOOLPATH} clean 964 ${Q}${MAKE} --no-print-directory -C ${ROMLIBPATH} clean 965 966realclean distclean: 967 @echo " REALCLEAN" 968 $(call SHELL_REMOVE_DIR,${BUILD_BASE}) 969 $(call SHELL_DELETE_ALL, ${CURDIR}/cscope.*) 970 ${Q}${MAKE} --no-print-directory -C ${FIPTOOLPATH} clean 971 ${Q}${MAKE} --no-print-directory -C ${SPTOOLPATH} clean 972 ${Q}${MAKE} PLAT=${PLAT} --no-print-directory -C ${CRTTOOLPATH} clean 973 ${Q}${MAKE} --no-print-directory -C ${ROMLIBPATH} clean 974 975checkcodebase: locate-checkpatch 976 @echo " CHECKING STYLE" 977 @if test -d .git ; then \ 978 git ls-files | grep -E -v 'libfdt|libc|docs|\.rst' | \ 979 while read GIT_FILE ; \ 980 do ${CHECKPATCH} ${CHECKCODE_ARGS} -f $$GIT_FILE ; \ 981 done ; \ 982 else \ 983 find . -type f -not -iwholename "*.git*" \ 984 -not -iwholename "*build*" \ 985 -not -iwholename "*libfdt*" \ 986 -not -iwholename "*libc*" \ 987 -not -iwholename "*docs*" \ 988 -not -iwholename "*.rst" \ 989 -exec ${CHECKPATCH} ${CHECKCODE_ARGS} -f {} \; ; \ 990 fi 991 992checkpatch: locate-checkpatch 993 @echo " CHECKING STYLE" 994 @if test -n "${CHECKPATCH_OPTS}"; then \ 995 echo " with ${CHECKPATCH_OPTS} option(s)"; \ 996 fi 997 ${Q}COMMON_COMMIT=$$(git merge-base HEAD ${BASE_COMMIT}); \ 998 for commit in `git rev-list $$COMMON_COMMIT..HEAD`; do \ 999 printf "\n[*] Checking style of '$$commit'\n\n"; \ 1000 git log --format=email "$$commit~..$$commit" \ 1001 -- ${CHECK_PATHS} | \ 1002 ${CHECKPATCH} ${CHECKPATCH_OPTS} - || true; \ 1003 git diff --format=email "$$commit~..$$commit" \ 1004 -- ${CHECK_PATHS} | \ 1005 ${CHECKPATCH} ${CHECKPATCH_OPTS} - || true; \ 1006 done 1007 1008certtool: ${CRTTOOL} 1009 1010.PHONY: ${CRTTOOL} 1011${CRTTOOL}: 1012 ${Q}${MAKE} PLAT=${PLAT} USE_TBBR_DEFS=${USE_TBBR_DEFS} --no-print-directory -C ${CRTTOOLPATH} 1013 @${ECHO_BLANK_LINE} 1014 @echo "Built $@ successfully" 1015 @${ECHO_BLANK_LINE} 1016 1017ifneq (${GENERATE_COT},0) 1018certificates: ${CRT_DEPS} ${CRTTOOL} 1019 ${Q}${CRTTOOL} ${CRT_ARGS} 1020 @${ECHO_BLANK_LINE} 1021 @echo "Built $@ successfully" 1022 @echo "Certificates can be found in ${BUILD_PLAT}" 1023 @${ECHO_BLANK_LINE} 1024endif 1025 1026${BUILD_PLAT}/${FIP_NAME}: ${FIP_DEPS} ${FIPTOOL} 1027 ${Q}${FIPTOOL} create ${FIP_ARGS} $@ 1028 ${Q}${FIPTOOL} info $@ 1029 @${ECHO_BLANK_LINE} 1030 @echo "Built $@ successfully" 1031 @${ECHO_BLANK_LINE} 1032 1033ifneq (${GENERATE_COT},0) 1034fwu_certificates: ${FWU_CRT_DEPS} ${CRTTOOL} 1035 ${Q}${CRTTOOL} ${FWU_CRT_ARGS} 1036 @${ECHO_BLANK_LINE} 1037 @echo "Built $@ successfully" 1038 @echo "FWU certificates can be found in ${BUILD_PLAT}" 1039 @${ECHO_BLANK_LINE} 1040endif 1041 1042${BUILD_PLAT}/${FWU_FIP_NAME}: ${FWU_FIP_DEPS} ${FIPTOOL} 1043 ${Q}${FIPTOOL} create ${FWU_FIP_ARGS} $@ 1044 ${Q}${FIPTOOL} info $@ 1045 @${ECHO_BLANK_LINE} 1046 @echo "Built $@ successfully" 1047 @${ECHO_BLANK_LINE} 1048 1049fiptool: ${FIPTOOL} 1050fip: ${BUILD_PLAT}/${FIP_NAME} 1051fwu_fip: ${BUILD_PLAT}/${FWU_FIP_NAME} 1052 1053.PHONY: ${FIPTOOL} 1054${FIPTOOL}: 1055 ${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" --no-print-directory -C ${FIPTOOLPATH} 1056 1057sptool: ${SPTOOL} 1058.PHONY: ${SPTOOL} 1059${SPTOOL}: 1060 ${Q}${MAKE} CPPFLAGS="-DVERSION='\"${VERSION_STRING}\"'" --no-print-directory -C ${SPTOOLPATH} 1061 1062.PHONY: libraries 1063romlib.bin: libraries 1064 ${Q}${MAKE} PLAT_DIR=${PLAT_DIR} BUILD_PLAT=${BUILD_PLAT} ENABLE_BTI=${ENABLE_BTI} ARM_ARCH_MINOR=${ARM_ARCH_MINOR} INCLUDES='${INCLUDES}' DEFINES='${DEFINES}' --no-print-directory -C ${ROMLIBPATH} all 1065 1066# Call print_memory_map tool 1067memmap: all 1068 ${Q}${PYTHON} $(PRINT_MEMORY_MAP) $(BUILD_PLAT) 1069 1070cscope: 1071 @echo " CSCOPE" 1072 ${Q}find ${CURDIR} -name "*.[chsS]" > cscope.files 1073 ${Q}cscope -b -q -k 1074 1075help: 1076 @echo "usage: ${MAKE} [PLAT=<platform>] [OPTIONS] [TARGET]" 1077 @echo "" 1078 @echo "PLAT is used to specify which platform you wish to build." 1079 @echo "If no platform is specified, PLAT defaults to: ${DEFAULT_PLAT}" 1080 @echo "" 1081 @echo "platform = ${PLATFORM_LIST}" 1082 @echo "" 1083 @echo "Please refer to the User Guide for a list of all supported options." 1084 @echo "Note that the build system doesn't track dependencies for build " 1085 @echo "options. Therefore, if any of the build options are changed " 1086 @echo "from a previous build, a clean build must be performed." 1087 @echo "" 1088 @echo "Supported Targets:" 1089 @echo " all Build all individual bootloader binaries" 1090 @echo " bl1 Build the BL1 binary" 1091 @echo " bl2 Build the BL2 binary" 1092 @echo " bl2u Build the BL2U binary" 1093 @echo " bl31 Build the BL31 binary" 1094 @echo " bl32 Build the BL32 binary. If ARCH=aarch32, then " 1095 @echo " this builds secure payload specified by AARCH32_SP" 1096 @echo " certificates Build the certificates (requires 'GENERATE_COT=1')" 1097 @echo " fip Build the Firmware Image Package (FIP)" 1098 @echo " fwu_fip Build the FWU Firmware Image Package (FIP)" 1099 @echo " checkcodebase Check the coding style of the entire source tree" 1100 @echo " checkpatch Check the coding style on changes in the current" 1101 @echo " branch against BASE_COMMIT (default origin/master)" 1102 @echo " clean Clean the build for the selected platform" 1103 @echo " cscope Generate cscope index" 1104 @echo " distclean Remove all build artifacts for all platforms" 1105 @echo " certtool Build the Certificate generation tool" 1106 @echo " fiptool Build the Firmware Image Package (FIP) creation tool" 1107 @echo " sptool Build the Secure Partition Package creation tool" 1108 @echo " dtbs Build the Device Tree Blobs (if required for the platform)" 1109 @echo " memmap Print the memory map of the built binaries" 1110 @echo "" 1111 @echo "Note: most build targets require PLAT to be set to a specific platform." 1112 @echo "" 1113 @echo "example: build all targets for the FVP platform:" 1114 @echo " CROSS_COMPILE=aarch64-none-elf- make PLAT=fvp all" 1115